Cartridge for shotguns



Jan. 17, 1939. v J. SPENGLER 2,144,232

CARTRIDGE FOR SHOTGUNS Filed July 9, 1957 Patented Jan. 17, 1939 UNITED STATES PATENT QFFEE Application July 9, 1937, Serial No. 152,780 In France July 16, 1936 4 Claims.

This invention relates to cartridges for shot guns and has for its object to provide a cartridge capable of being recharged after use.

Cartridges for shot guns usually comprise a paper or like casing fitted in a brass base and said cartridges are usually closed by a paper or celluloid disc or washer which is maintained in position by setting back the outer end of the casing over a distance of about 5 to 7 mm. With such cartridges the paper casing is sometimes torn off the brass base and sometimes swells, thereby causing jamming in the bore of the gun, so that this form of cartridge is not suitable for recharging after use. Attempts have been made however, to provide rechargeable cartridges and according to one arrangement the cartridge was formed with an all metal casing closed by'a paper washer held in position by means of teeth stamped in the metal casing and bent down over the washer. This construction proved to be unsatisfactory however in that when the cartridge was discharged the metal teeth for retaining the paper washer in place were either torn off completely or so seriously damaged as to be incapable of further use.

All these disadvantages are eliminated in the cartridge according to the present invention by providing the cartridge casing with undeformable means for securing the closing disc or washer.

According to the invention the cartridge comprises a metal casing provided at its outer end with one or more internal annular grooves having a frustro conical part surmounted by a truly cylindrical part, the conical surface being inclined inwardly towards the base of the cartridge, and a closing disc dished to substantially frustro-conical shape and adapted to fit within said annular groove, or one of said annular grooves with its conical surface engaging the corresponding conical surface of the groove and its peripheral edge located in the cylindrical part of said groove.

The closing disc or washer is preferably composed of thin resilient metal such as light duralumin of about 0.2 mm. thickness or brass foil of about 0.15 mm. thickness.

In order that the invention may be more clearly understood one particular construction of cartridge made in accordance therewith will now be described, by way of example, with reference to the accompanying drawing wherein:

Figures 1 and 2 show a cross-section and plan view respectively of the closing disc or washer of the cartridge.

Figure 3 is a longitudinal section of the complete cartridge.

Figure 4 is a section of the outer end of the cartridge casing on an enlarged scale.

Figure 5 is a similar view to Figure 4 with the closing disc or washer ready to be inserted and Figure 6 is a similar view showing the closing disc or washer in its final position.

Referring to the drawing the cartridge comprises a metal casing 4 provided in its inner end with a percussion cap and formed near its outer end with a plurality of internal annular grooves 5, E, l in which fits a closing disc or washer I. The closing disc or washer l is dished as shown so as to be of substantially frustro-conical form, the conical part 2 extending upwardly when inserted in one of the grooves 5, 6 or '5. Each of the grooves 5, 6 and l comprises a frustro-conical part B and a truly cylindrical part, the conical surface 8 bein inclined inwardly and downwardly towards the base of the cartridge.

After the cartridge has been charged with powder and shot in the usual way, the closin washer or disc is placed in the position shown in Figure 5 and then pressed into the position shown in Figure 6. It will be clearly understood that as the closing disc or washer l is composed of thin resilient metal, as described above, its diameter will be reduced as it is pressed into the mouth of the casing 3 and will finally snap into the groove 5 where it will be retained to the upturned peripheral flange 2 projecting into the cylindrical part of the groove.

By providing a series of grooves the amount of powder and shot may be varied as desired.

With a cartridge constructed according to the invention no serious damage can be done to the casing or the grooves for retaining the closing disc when said cartridge is discharged and furthermore after said cartridge is recharged the closing disc can be inserted without the use of a special tool,

What I claim and desire to secure by Letters Patent is:

l. A cartridge for shot guns comprising, a cylindrical metal casing provided with at least one internal annular groove near its outer end and a resilient metal disc having a fiat central circular part and an annular frustro-conical rim, the free diameter of said disc being greater than the internal diameter of said casing and fitting resiliently in said annular groove for retaining a shot and powder charge within said casing.

2. A cartridge for shot guns comprising, a cylindrical metal casing provided with at least one internal annular groove near its outer end and a resilient metal washer having an annular frustroconical rim, the free diameter of said washer being greater than the internal diameter of said casing and fitting resiliently in said annular groove for retaining a shot and powder charge within said casing.

3. A cartridge for shot guns comprising, a cylindrical metal casing provided with at least one internal annular groove near its outer end, said groove having a frustro-conical part surmounted by a cylindrical part, and a resilient metal disc having a fiat central circular part and an annular frustro-conical rim, the free diameter of said disc being greater than the internal diameter of said casing and fitting resiliently in said annular groove for retaining a shot and powder charge within said casing.

4. A cartridge for shot guns comprising, a cylindrical metal casing provided with at least one internal annular groove near its outer end, said groove having a frustro-conical part surmounted by a cylindrical part, and a resilient metal washer having an annular frustro-conical rim, the free diameter of said Washer being greater than the internal diameter of said casing and fitting resiliently in said annular groove for retaining a shot and powder charge Within said casing.

J ULES SPENGLER. 

